Welcome great EduPodian, here is your Second Term SS2 Physics Lesson Note excerpt.
Scheme of Work
1 Heat energy – temperature and its measurement
2 Heat capacity and specific heat capacity
3 Calculations on specific heat capacity
4 Evaporation, boiling and melting points and their determination. Effects of impurities and pressure on boiling and melting
5 Latent heat – Fusion and vaporization
6 Vapor pressure – Saturated and unsaturated vapor pressure and its relation to boiling. Humidity ,Relative Humidity, Dew point and its relationship to weather
Mid-term project
7 Gas Laws – Boyle’s, Charles’, Pressure and General gas law
8 Production and propagation of waves
9 Properties of waves – reflection, refraction, diffraction, interference and polarization
10 Light waves – source, reflection, reflection plane and curved mirrors
11 Refraction of light – refractive index, its determination, total internal reflection and critical angle
12 Revision
13 Examination
Week 1:
HEAT ENERGY
Heat
Temperature
Measurement of temperature
Thermometers
Heat
Heat is a measure of total internal energy of a body. It is a form of energy due to a temperature difference. It is measured in Joule, J
Temperature
Temperature is the degree of hotness or coldness of a body. The unit of temperature is in degree Celsius (0C) or Kelvin (K)
Measurement of temperature
Temperature is measured by using thermometers. Thermometers have two reference temperatures or fixed points called the upper fixed point and lower fixed point.
The upper fixed point is the temperature of steam from pure water boiling at standard atmospheric pressure of 760mm of mercury. It is 1000C
The lower fixed point is the temperature of pure melting ice at the standard atmospheric pressure of 760mm of mercury. It is 00C
Temperature scales
The difference in temperature between the upper and lower fixed points is called fundamental interval of a thermometer. The calibration of this interval depends on any of the three scales below:
1. Celsius scale
2. Fahrenheit scale
3. Kelvin or Absolute scale
The S. I. Unit of temperature is the Kelvin. However, it is also measured in degree Celsius and Fahrenheit.
Thermometers
Thermometers are… Click here to order the complete Physics Lesson Note for SS2 second term
Week 2:
HEAT CAPACITY AND SPECIFIC HEAT CAPACITY
MEASUREMENT OF HEAT ENERGY
In order to assess the quantity of heat energy possessed by a body, three quantities are needed. They are:
the change in temperature (θ)
the specific heat capacity of the body (C)
mass of the body (m)
The quantity of heat Q of a body is a product of the three quantities above as expressed by the equation.
Q=MCΔθ …1
It is measured in Joules
Heat capacity
This is the quantity of heat required to raise the temperature of a substance by one degree. It is measured in Joules/K.
Heat capacity=Mass of specific ×specific heat capacity of the substance
C=mc …2
Specific heat capacity
Specific heat capacity of a substance is… Click here to order the complete second term Physics Lesson Note for SS2
Week 3:
DETERMINATION OF SPECIFIC HEAT CAPACITY BY ELECTRICAL METHOD
For a solid:
To calculate the specific heat capacity Cb of a solid brass block, we make two holes in a weighed brass block into which a thermometer and a heating element connected to a source of power supply are inserted. Oil is poured in the holes to ensure thermal conductivity. Assuming no heat is lost to the surrounding, the total amount of electrical heat energy supplied by the coil is… Click here to order the complete Lesson Note on Physics SS2 second term
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